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D( x )
2*x-2 = 0
2*x-2 = 0
2*x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x in (-oo:1) U (1:+oo)
(10*x-2)/(2*x-2) = 0
10*x-2 = 0 // + 2
10*x = 2 // : 10
x = 2/10
x = 1/5
x = 1/5
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